East Sussex · England
Three Leg Cross External Mastic
Specialist external mastic for Three Leg Cross: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Water getting into walls through failed joints
- Old sealant gone brittle and cracked
- Movement joints filled with mortar instead of sealant
External mastic for homes and businesses in Three Leg Cross
Low-level joints can generally be done from the ground. For joints higher up, give us some details of the building and we will confirm what access is needed. If you are dealing with movement joints filled with mortar instead of sealant and gaps where render, brick and frames meet, we can help, on joints between brick and frames, façade panels and concrete & block alike.
Outside joints can only be sealed when they’re dry, so work in Three Leg Cross is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
All our work comes with a one-year guarantee, wherever you are in East Sussex.
- Location
- Three Leg Cross (TN5)
- Wider area
- East Sussex
- Cover
- A year, on every job
- Quotes
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Do you need external mastic in Three Leg Cross?
Some movement joints have been pointed up with mortar by mistake. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
Signs it’s time to call us include:
- Sealant that has lost its bond to the brick or render
- Movement joints with cracked, split or missing sealant
- Moss and dirt in joints with no sealant left
- Movement joints filled with mortar instead of sealant
Rented homes near Stonegate station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Before booking anyone
- Whether they seal over old material or remove it
- What product goes in the joint
- What preparation is included
- Who does the work, and how experienced they are
How it works
Once we are on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. Most jobs then take a few hours to a few days, depending on the length of joint and the access. Somewhere as small as Three Leg Cross, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- For business premises, tell us about site rules or sign-in
- Plan for the work area to be out of bounds to pets and children
- Mention any leaks or damp you’ve noticed
Get a quote
Call for a quick quote, or email us if that’s easier. Describe what needs sealing and we’ll talk you through the work.
Related advice
How we quote for external mastic
The price is agreed before any work begins. It takes into account:
- The number and length of the joints
- How much old sealant there is and how hard it is to remove
- Whether the work is at height
- Any mould that needs treating
Combining jobs into one visit is usually more efficient than separate visits. We will give you a clear price for the lot.
What to tell us for a quote
To help us quote quickly, let us know:
- Roughly how big the job is
- The address or postcode of the job
- A few photos by email, if you can
- Access, such as stairs, a lift or height
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll explain how we’d tackle it. Whenever you are ready, phone 0345 464 0079 or email us.
What the job involves on each surface
Render joints
Render has movement joints and stop beads that need sealing. We reseal them with a flexible exterior sealant that suits the render colour.
Copings and trims
Coping joints that leak let water straight down into the wall. Resealing them is a small job that protects a lot.
Places near Three Leg Cross
Also in Three Leg Cross
Your questions about external mastic in Three Leg Cross
Is Three Leg Cross within the area you cover?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can you do external mastic in Three Leg Cross?
Yes, Three Leg Cross is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or email us and tell us what needs doing.
What should I tell you?
Only a few details: where it is, what you’ve noticed and how we reach it. Then phone 0345 464 0079 or drop us an email.
Does someone need to be in?
Access is agreed with you when the job is booked. Indoors, that normally means someone at home.
Can you quote for more than one area?
Yes. Just list everything you need and you will get one quote.
Do the sealants smell?
There can be a smell while the sealant cures, which fades as it sets. Opening a window helps.
Will the old sealant be removed?
Always. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Can landlords and businesses book you?
Yes, often. Several properties can be quoted together, and between tenancies is a good time for the work.
Looking after it afterwards
So the new joints stay in good condition:
- Keep movement joints as flexible joints, not mortar
- Don’t let climbing plants root in the sealant
- Deal with leaking gutters that soak the joints below
- Act on the first splits you see
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They should be kept open and resealed, not filled.
Small splits are the time to act. Then it’s a straightforward cut-out and reseal.
Landlord and commercial work in Three Leg Cross
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll give you a quote.
Outside joints around Three Leg Cross
Historic houses like Scotney Castle (about 2.6 miles north) are a reminder that the area around Three Leg Cross has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
In the older streets around St Mary's Church, old and new materials meet at the roofline and walls, which is where sealant earns its keep. Managing a site like Ticehurst and Flimwell Church of England Primary School? Then larger buildings have long runs of movement joint that eventually need resealing.
Three Leg Cross is about 8 miles south-east of Royal Tunbridge Wells, in East Sussex. Jobs in Three Leg Cross get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Our area takes in 289 places across East Sussex, from the larger towns to small villages. There’s also a page for Crawley, about 26 miles away.
Work in TN5 works the same way as everywhere else we cover. If you are just outside Three Leg Cross, we cover Ticehurst (1 mile south-east), Stonecrouch (1 mile north-east), Flimwell (2 miles east), Kilndown (2 miles north) and Bedgebury Cross (3 miles north-east). Larger places within reach include Hastings (15 miles south-east), Bexhill-on-Sea (15 miles south), Hailsham (15 miles south-west), Crowborough (10 miles west), St Leonards (15 miles south-east) and Uckfield (14 miles south-west).
Around Three Leg Cross
In Three Leg Cross, that means homes and buildings near The Bull Inn Public House, among other places. For rail, the closest station is Stonegate station, about 3 miles south-west of the centre. A little further out are Old Scotney Castle (2.5 miles north) and Finchcocks Musical Museum (3.4 miles north). Green spaces nearby include Bewl Water.
Why it’s worth doing now in Three Leg Cross
Running new sealant over the old bead rarely lasts. New sealant doesn’t bond well to old, weathered sealant, so we always take the old sealant out. Older cottages and farmhouses around Three Leg Cross can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
The cost depends on how much there is to do, how much old material has to come out and how easy the joints are to reach. You will have a clear quote before any work starts.
Why book with us
- Trusted Arbo and Everbuild sealants
- We’re fully insured
- An ARBOMaster approved applicator
- Over 20 years’ experience
Read what affects the cost or customer reviews.